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spi: dw: Add support for an optional interface clock 

The Synopsys SSI Controller has an interface clock, but most SoCs hide
this away. However, on some SoCs you need to explicitly enable the
interface clock in order to access the registers. Therefore, add support
for an optional interface clock.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.2
Phil Edworthy 2019-03-19 15:52:07 +00:00 committed by Mark Brown
parent 2f324ac7cf
commit 560ee7e910
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GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
drivers/spi/spi-dw-mmio.c
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@ -30,6 +30,7 @@
struct dw_spi_mmio {
struct dw_spi dws;
struct clk *clk;
struct clk *pclk;
void *priv;
};
@ -172,6 +173,14 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
if (ret)
return ret;
/* Optional clock needed to access the registers */
dwsmmio->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
if (IS_ERR(dwsmmio->pclk))
return PTR_ERR(dwsmmio->pclk);
ret = clk_prepare_enable(dwsmmio->pclk);
if (ret)
goto out_clk;
dws->bus_num = pdev->id;
dws->max_freq = clk_get_rate(dwsmmio->clk);
@ -199,6 +208,8 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
return 0;
out:
clk_disable_unprepare(dwsmmio->pclk);
out_clk:
clk_disable_unprepare(dwsmmio->clk);
return ret;
}
@ -208,6 +219,7 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
dw_spi_remove_host(&dwsmmio->dws);
clk_disable_unprepare(dwsmmio->pclk);
clk_disable_unprepare(dwsmmio->clk);
return 0;